CPU_COUNT

Property	Description
Parameter type	Integer
Default value	`0`
Modifiable	`ALTER SYSTEM`
Range of values	`0` to unlimited
Basic	No

CPU_COUNT specifies the number of CPUs available for Oracle Database to use. On core architectures, it specifies the number of available CPU cores. Various components of Oracle Database are configured based on the number of CPUs, such as the Optimizer, Parallel Query, and Resource Manager.

If CPU_COUNT is set to 0 (its default setting), then Oracle Database continuously monitors the number of CPUs reported by the operating system and uses the current count. If CPU_COUNT is set to a value other than 0, then Oracle Database will use this count rather than the actual number of CPUs, thus disabling dynamic CPU reconfiguration. When Resource Manager is enabled, setting CPU_COUNT limits the CPU utilization to approximately CPU_COUNT processors.

Note:

Setting CPU_COUNT to a value greater than the current number of CPUs results in an error. However, if CPU_COUNT is set to a value greater than the current number of CPUs in the initialization parameter file, then CPU_COUNT is capped to the current number of CPUs.